WO1993013865A1 - Centrifuge a vis a bol plein - Google Patents

Centrifuge a vis a bol plein Download PDF

Info

Publication number
WO1993013865A1
WO1993013865A1 PCT/EP1992/002866 EP9202866W WO9313865A1 WO 1993013865 A1 WO1993013865 A1 WO 1993013865A1 EP 9202866 W EP9202866 W EP 9202866W WO 9313865 A1 WO9313865 A1 WO 9313865A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
distributor pipe
centrifuge
pipe
inlet
Prior art date
Application number
PCT/EP1992/002866
Other languages
German (de)
English (en)
Inventor
Ulrich Wrede
Original Assignee
Westfalia Separator Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westfalia Separator Aktiengesellschaft filed Critical Westfalia Separator Aktiengesellschaft
Publication of WO1993013865A1 publication Critical patent/WO1993013865A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw

Definitions

  • the invention relates to a solid-bowl screw centrifuge for separating a 2-phase liquid mixture, which can also contain solids, with a drum which can be driven in rotation and a screw conveyor which can be driven in rotation in the drum at a differential speed, the spirals of which are arranged on a screw body.
  • an inlet chamber is provided, to which an inlet pipe is assigned and which communicates with the interior of the drum via at least two mutually opposite openings provided in the wall of the screw body, the drum being provided with means for setting a separation zone allow between the two liquid phases.
  • Such a solid-bowl screw centrifuge is known from DE C 29 01 607.
  • a separation zone is established between the two phases of the liquid mixture supplied.
  • the heavier phase collects in the radially outermost drum area, and the lighter phase lies radially inward above it.
  • the diameter of the screw body is chosen so that it does not affect the liquids.
  • the suspension supplied via the inlet pipe and the inlet chamber initially enters through the openings in the screw body a liquid-free area of the drum, then hits the surface of the light liquid phase and penetrates it, in order to subsequently also break down into its constituents under the influence of the centrifugal force.
  • the light phase which has already been separated penetrates, it is mixed again with the heavy liquid phase by the mixture supplied. This has a negative impact on the separation result as a whole.
  • the speed at which the centrifuged material exits the channels is approximately the same is like the peripheral speed at the outlet openings of the channels. The further the channels extend radially outwards, the greater the undesired rinsing effect.
  • the object of the invention is to design the inlet area of the known centrifuge in such a way that the suspension of the already separated liquid phases is avoided.
  • inlet chamber and the openings are penetrated by a distributor pipe which, with its two outlet openings, extends in each case into a region of the drum in which the separation zone "T" between the two liquid phases occurs, where the wall of the distributor pipe is provided with a central inlet opening which is operatively connected to the inlet pipe.
  • a typical field of application for the generic centrifuge is the separation of an oil-water mixture, which can also contain solids.
  • Three layers are formed in the centrifuge drum, namely the solids as the radially outermost layer, the water above and the oil as the radially innermost layer.
  • the oil particles separated from the water move radially inward during the separation process. If in this case the outlet openings of the channels extend into the
  • the rinsing effect does not affect the particularly sensitive oil phase at all.
  • the rinsing effect in the solids results in the oil components still adhering to it being washed off.
  • the impact of the centrifugal product on the already separated oil phase, and thus an impairment of this phase, which is present in the generic centrifuge, is avoided and, on the other hand, the rinsing effect is used in a positive manner.
  • the outlet openings of the distributor open into the heavy one Liquid phase. This is particularly advantageous if the proportion of the heavy liquid phase predominates, since the larger amount of the heavy liquid phase can then pass through the light liquid phase without crossing and thus no undesirable mixing effects occur.
  • the outlet openings of the distributor open into the light liquid phase. This is advantageous if the proportion of the light liquid phase predominates, since then the larger amount of the light liquid phase does not affect the heavy liquid phase, while the smaller proportion of the heavy liquid phase only has to cover a short separation path within the light liquid phase .
  • a further advantageous embodiment is characterized in that the distributor pipe has a rectangular cross section.
  • a homogeneous speed profile is formed on the walls of a rectangular distributor pipe, as a result of which the influence of the already separated liquid phases is particularly small.
  • At least two channels are formed in the distributor pipe by axially extending walls, the walls lying in a plane which runs through the axis of symmetry of the drum.
  • Fig. 1 shows a cross section through the drum of the solid bowl centrifuge
  • FIG. 1 denotes the drum of the solid-bowl screw centrifuge in which a screw conveyor 2 is arranged, the spirals 3 of which are arranged on a screw body 4.
  • An inlet chamber 5 is provided in the screw body 4 and has two openings 6 located opposite one another and provided in the wall of the screw body 4.
  • the inlet chamber 5 and the openings 6 are penetrated by a distributor pipe 7 which, with its two outlet openings 8, 9, each extends into a region of the drum 1 in which the separation zone "T" between the two liquid phases is established.
  • the wall of the distributor pipe 7 is with a provided central inlet opening 10, which is in operative connection with an inlet tube 11.
  • the drum 1 is tapered at one end and provided with discharge openings 12 for the solid. At the other end of the drum means 13, 14 are provided which enable the setting of a separation zone between the two liquid phases.
  • the suspension to be separated is fed to the drum 1 via the inlet pipe 11 and passes via the inlet opening 10 into the distributor pipe 7, which rotates with the screw 2.
  • the suspension in the parallel channels 16, 17 is accelerated to the speed of the screw 2 and then passes through the two outlet openings 8, 9 into the region of the separation zone "T" of the two liquid phases, without one of these
  • the solid particles separated from the suspension collect on the wall of the drum 1 and are conveyed by the spirals 3 in the direction of the discharge openings.
  • the separated liquid phases leave the drum 1 at the opposite end.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Une centrifuge à vis à bol plein sert à séparer un mélange liquide à deux phases contenant des matières solides. Le produit à séparer est introduit dans un tambour (1) par un tuyau d'admission (11) et parvient par un orifice d'admission (10) dans un tuyau distributeur (7) qui tourne avec une vis (2) située dans le tambour (1). Dans le tuyau distributeur (7), le produit est accéléré jusqu'à la vitesse de rotation de la vis (2) et parvient ensuite à travers deux orifices de sortie (8, 9) dans une zone de séparation 'T' entre les deux phases liquides, sans avoir à passer à travers une de ces phases. On obtient ainsi non seulement une accélération en douceur du produit, mais aussi une alimentation en produit exempte de croisements, ce qui permet d'améliorer le résultat de la séparation dans le cas des deux phases liquides séparées.
PCT/EP1992/002866 1992-01-21 1992-12-11 Centrifuge a vis a bol plein WO1993013865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924201427 DE4201427A1 (de) 1992-01-21 1992-01-21 Vollmantelschneckenzentrifuge
DEP4201427.1 1992-01-21

Publications (1)

Publication Number Publication Date
WO1993013865A1 true WO1993013865A1 (fr) 1993-07-22

Family

ID=6449897

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002866 WO1993013865A1 (fr) 1992-01-21 1992-12-11 Centrifuge a vis a bol plein

Country Status (2)

Country Link
DE (1) DE4201427A1 (fr)
WO (1) WO1993013865A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5683343A (en) * 1991-11-27 1997-11-04 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US6780147B2 (en) 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US6790169B2 (en) 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US7018326B2 (en) 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US7060019B2 (en) * 2000-11-14 2006-06-13 Westfalia Separator Ag Solid bowl screw centrifuge comprising a distributor
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622794A (en) * 1948-09-16 1952-12-23 Sharples Corp Centrifugal separator
FR1497103A (fr) * 1965-10-20 1967-10-06 Pennsalt Chemicals Corp Perfectionnements aux centrifugeuses
DE2103829A1 (de) * 1970-01-30 1971-08-05 Pennwalt Corp , Philadelphia, Pa (V St A) Zentrifuge
DE3202294C1 (de) * 1982-01-26 1983-04-21 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor
DE3723864A1 (de) * 1987-07-18 1989-01-26 Westfalia Separator Ag Vollmantel-schneckenzentrifuge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1976574U (de) * 1963-06-01 1968-01-04 Voith Gmbh J M Schneckenzentrifuge.
DE2901607C2 (de) * 1979-01-17 1981-03-12 Westfalia Separator Ag, 4740 Oelde Vollmantelschneckenzentrifuge
GB8620436D0 (en) * 1986-08-22 1986-10-01 Mozley R H Centrifugal solids-liquids separator
DE3638782A1 (de) * 1986-11-13 1988-05-26 Krupp Gmbh Verfahren zur abtrennung von feststoffen aus suspensionen und zentrifugaldekanter zur durchfuehrung des verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622794A (en) * 1948-09-16 1952-12-23 Sharples Corp Centrifugal separator
FR1497103A (fr) * 1965-10-20 1967-10-06 Pennsalt Chemicals Corp Perfectionnements aux centrifugeuses
DE2103829A1 (de) * 1970-01-30 1971-08-05 Pennwalt Corp , Philadelphia, Pa (V St A) Zentrifuge
DE3202294C1 (de) * 1982-01-26 1983-04-21 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor
DE3723864A1 (de) * 1987-07-18 1989-01-26 Westfalia Separator Ag Vollmantel-schneckenzentrifuge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5683343A (en) * 1991-11-27 1997-11-04 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US6780147B2 (en) 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US6790169B2 (en) 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US7018326B2 (en) 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US7060019B2 (en) * 2000-11-14 2006-06-13 Westfalia Separator Ag Solid bowl screw centrifuge comprising a distributor
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator

Also Published As

Publication number Publication date
DE4201427A1 (de) 1993-07-22

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